Los Angeles Fire Department chief Ralph Terrazas said during a Mondaypress conferencethat favorable weather conditions allowed for firefighters to make progress on Sunday.

“As long as the weather continues to cooperate, I am very confident and convinced we’ll be fine,” he said. But he stressed that fire operations are ongoing and “there is still a lot of work to be done.”

More than a thousand firefighters are currently working to control the blaze, which erupted on Friday. Several aircraft have been dropping water and fire retardant on hot spots.

As of Monday, the fire had charred 7,003 acres — a number Terrazas said he anticipates will increase “slightly” in the coming days. It is now 30 percent contained — up from10 percent containmentearly Sunday morning. Four firefighters have suffered heat-related illnesses, and another was treated for minor burns. All are in stable condition, according to Terrazas.

The flames have also destroyed four houses. Terrazas said Monday that the low number is a “testament to the outstanding work” of area firefighters.

“We’re confident, back to 1961 — the Bel Air Fire — that this is the largest fire, by acreage, within the city of Los Angeles,” Terrazas said. The Bel Air Fire scorched 6,090 acres and destroyed 484 costly residences and 21 other buildings,according to a historical archivekept by LAFD.

The fire, dubbed the La Tuna Fire, started in West La Tuna Canyon Road in Sun Valley Friday afternoon, reports the Los Angeles Times. It started as a small brush fire sparked by a triple digit heat wave and quickly spread due to shifting winds.